Used Peavey TB Raxx preamp. This is a great pre - has 2, 12ax7 tubes in it and goes from a little tube dirt to full out fuzz distortion. also works great for guitars. Currently has a 12at7 installed in the first tube slot which tamed it down a little so it didnt break up as quickly as with a 12ax7 in the slot. I will glady replace the 12at7 with a 12ax7 if the buyer wishes but I think it sounds better with the 12at7 in it $150 shipped to the lower 48 or local pickup ok.